AIR POLLUTION
CONTROL DISTRICT

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Old Advisory Events

The information herein is NOT intended for use as a weather forecast. The Air District DOES NOT forecast but solely compiles information from both the Phoenix and San Diego National Weather Offices to relay information concerning potential changes in ambient air concentrations that may impact the public.

June 16 2017
Be Advised
High wind levels have the potential to suspend particulate matter into the air. High levels of PM10 may pose an impact to public health. It is recommended that active children and adults, and people with respiratory disease, such as asthma, limit their outdoor activities.

Potential increases in PM10 concentrations may increase to moderate or unhealthy level.

Imperial County Weather Synopsis
SYNOPSIS FROM THE SAN DIEGO OFFICE
Strong upper-level high pressure building over the Southwest will create very hot weather inland through next week. A shallow marine layer will keep coastal areas cooler through the period, with areas of night and morning low clouds and fog. Sun: Palm Springs 116 (116), and Idyllwild 90 (92). Excessive heat forecast remains on track through mid to late next week. The second, more intense phase of the heat wave from Monday to Wednesday is now looking to be even hotter than previously forecast with temperatures likely to break records and may even approach all time record highs regardless of the date in a few locations. The areas of low confidence with this forecast is whether the Valleys, especially the San Diego County Valleys, will reach excessive heat conditions during the forecast period. Right now we continue with a heat advisory for the Inland Empire, and conditions are not quite reaching excessive heat level for the San Diego Valleys. The other area of lower confidence right now is how long the heat wave will last. Right now the heat warnings and advisories are out through Wednesday.
Mon: Palm Springs 116 (119)
Tue: Palm Springs 118 (120), and Thermal 118 (118)
Wed: Palm Springs 118 (117), and Thermal 117 (117)
SYNOPSIS FROM THE PHOENIX OFFICE
Strong high pressure will build over the Desert Southwest the rest of this week and into next week. This will result in the first major heat wave of the summer with high temperatures climbing well above 110 degrees in the lower deserts Saturday through Wednesday. In fact, many desert locations, including Phoenix, will
reach 115 to 120 degrees Sunday through Thursday. The general forecast trends remain the same with an excessive heat episode in store. In fact, the Warning area has been expanded to cover the rest of our southeast California zones including the higher terrain portion of Joshua Tree National Park. Despite some weakening of the high and "cooling" in the lower levels, temps still hot enough to keep the Warning going. So the Excessive Heat Warning has been extended to Thursday.
CLIMATE…
Record highs later this week into next week:
Date Phoenix Yuma
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6/16 115 in 1974 119 in 1917
6/17 114 in 2015 115 in 1981
6/18 115 in 2015 116 in 2015
6/19 118 in 2016 120 in 2016
6/20 116 in 2016 116 in 2008
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